Perimeter resealing of fixed windows is a practical, cost-effective method to stop leaks and reduce air infiltration when the IGU is intact and the frame is structurally sound. Proper joint geometry, substrate prep, compatible materials, and correct tooling are essential for durable performance; replace failed insulated units or damaged frames when needed.
Wipe down the frame and the wall with a damp cloth to remove dust and debris. Let the area dry completely; sealant will not adhere properly to wet surfaces. Prep with Painter’s Tape (Optional but Recommended) how to reseal a window fixed